Friends of the National Arboretum will host their annual Lahr Symposium this weekend, and as a part of the event, the public is allowed to shop for native plants from some of the best vendors in the region. Many of these vendors only sell at such events.... so if you need some native plants for your yard this is the place to go!
Don't worry if you aren't entirely familiar with natives yet... most vendors bring photos, and offer detailed information about the needs of each plant. Many of them are also very generous with advice.
People who have paid to attend the Lahr Symposium that morning will have first crack at the vendors' offerings, the public will be allowed in for free from 9:30am until 2:00pm.
Remember: most vendors accept cash or checks only.
In the past I've scooped up some incredible bargains, such as trumpet honeysuckle for only $10. Besides good prices, there are plants you simply cannot find anywhere else.